Lure him under the two spike gates. Release them when he slithers under it. Lure him into the center cage, jump out, run to where he sarted from, and roll the lever. No more Malichia.

Deafeating Dumah

Pull the three stakes out of him to bring him back to life. Lure him into the furnace room slowly, if you move too fast, he will return to his room. Turn on the gas and hit the switch after he is in the furnace room. Hehe...toast.

Defeating Zephon

Bring a torch with you. Run up to his bell, and swipe at the hole. He will attack with his leg and get it stuck, hit his leg. Strike the egg hole to cause more damage. Any time he gets a leg stuck, hit it with the torch. If you hit the egg sack, he will die. You get the scaling walls ability.

Defeating Rahab

Shoot out the windows. Use the force blast. After he dies, you gain the swimming ability.

Defeating Kain

Wait for him to materialize, then hit him. He will appear behind you almost every time. You get Soul Reaver when he is finished.

Defeating Kain

You need Soul Reaver to do damage. The spit forge refills your health. After you hit him, he will go to the next tier, keep hitting him.....until the last tier, one more hit and he's done for.